CN107408975A - Digital repeater system - Google Patents
Digital repeater system Download PDFInfo
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- CN107408975A CN107408975A CN201580078132.9A CN201580078132A CN107408975A CN 107408975 A CN107408975 A CN 107408975A CN 201580078132 A CN201580078132 A CN 201580078132A CN 107408975 A CN107408975 A CN 107408975A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15535—Control of relay amplifier gain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
A kind of digital repeater system for being used to relay RF signals, it can include being used for the acceptance division for receiving RF input signals, the RF input signals include the frequency band with least one sub-band associated with the communication channel of communication network.Acceptance division can digitize RF input signals to obtain data signal.Filter apparatus includes the digital filter with the passband being filtered to data signal.Digital filter can be configured by setting filter coefficient.AGC device can set at least one of gain of data signal.Sending part can send RF output signals and can convert digital signals into RF output signals to be transmitted.Control unit can be set to configure the filter coefficient of digital filter based on the gain of AGC device.
Description
Cross-reference to related applications
Entitled " the Digital Repeater System " Europe that application claims were submitted on March 27th, 2015
Number of patent application EP15161404.7 priority, this application full content are incorporated herein by reference.
Technical field
The disclosure is related generally to relay the digital repeater system of RF signals and is related to for controlling in numeral
After the method for device system.
Background technology
Repeater system can serve the broadband of for example complete 3GPP frequency bands.Frequency band generally comprises carrying according to not
With multiple carrier waves of the communication technology and the information of standard (GSM, UMTS, LTE etc.).
Repeater system can be used aboard, to provide the network coverage in train.High-speed train application can provide
Extremely challenging RF environment.The complexity of different terrain is combined with the fast-changing outdoor signal level of various networks to be made
Operator be difficult to client provide they from city travel to city or it is national to another when required covering kimonos
Business.In order to improve the reliability of wireless signal on train, shape can be section for the repeater system of distributing antenna system (DAS)
About cost.DAS for example in train and can be used for amplified signal, with compensate as caused by train decay (for example,
Penetrated into because the metallization window on high-speed train reduces signal in railway carriage, this can cause spot to cover (spotty
Coverage) and dropped call).
Signal intensity obtained by macrocell from the base station outside train can change as train is mobile.In some tools
In the region for having good network covering, the signal inside train can be consumingly overlapping (overlay) by the original source signal of base station.
Movement station in railway carriage can receive simultaneously the base station outside train in directapath signal and via installed in
Signal on the indirect path of DAS on train.If being delayed between the signal received via different paths is certain
Limit, then this multipath propagation can cause connection to go offline or can reduce data throughout.
For example, in the lte networks, delay extension (delay spread) can be limited by the time of cyclic prefix (CP)
System.If the delay between unlike signal path is more than used CP, then dropped call be present or data throughout subtracts
Small risk.
The solution for reducing the risk that connection goes offline is increase CP.However, this brings the intrinsic of data throughout reduction
Defect.
The content of the invention
In one example, digital repeater system can relay RF signals.Digital repeater system includes acceptance division, filter
Ripple device equipment, AGC device, sending part and control unit.Acceptance division can be configurable for receiving RF input signals,
The RF input signals include having at least one sub-band associated with least one communication channel of communication network at least
One frequency band.Acceptance division can be configured as digitizing RF input signals to obtain data signal.Filter apparatus includes tool
There is at least one digital filter of passband, for carrying out digital filtering to data signal.Digital filter can be filtered by setting
Ripple device coefficient is configured.AGC device can be configured to set at least one of gain of data signal.Sending part quilt
It is configured for sending RF output signals and is used to send for converting digital signals into RF output signals.Control unit is suitable to
Gain based on AGC device is set to configure the filter coefficient of at least one digital filter.
In another example, there is provided a kind of method, this method include：
By digital repeater system acceptance division receive RF input signals, the RF input signals include comprising with communication network
The associated at least one sub-band of at least one communication channel at least one frequency band, acceptance division carries out RF input signals
Digitize to form data signal；
Digital filtering is carried out to data signal by the filter apparatus including at least one digital filter, this is at least one
Digital filter has the passband for being used for being filtered to data signal, and wherein at least one digital filter is to pass through setting
Filter coefficient configures；
The gain of data signal is controlled by the AGC device of the gain of setting data signal；
The filtering of at least one digital filter is configured based on the gain of the AGC device set by control unit
Device coefficient；And
RF output signals are converted digital signals into by least one sending part of digital repeater system and to send RF defeated
Go out signal.
Brief description of the drawings
Fig. 1 shows the digital repeater system for including being connected to the main computer unit of multiple remote units according to one aspect
Schematic diagram.
Fig. 2, which is shown in main computer unit and remote unit according to one aspect, is used for RF signals on downlink direction
The schematic diagram of the function treatment block of digital processing.
Fig. 3 shows the schematic diagram of repeater system according to one aspect.
Fig. 4 shows the repeater system in the communication between the movement station on base station and train according to one aspect
Schematic diagram.
Fig. 5 shows the frequency response of digital filter according to one aspect.
Fig. 6 shows the flow chart for being used to control the process of the filter coefficient of digital filter according to one aspect.
Embodiment
Some aspect and feature are related to the digital repeater system for relaying RF signals.Digital repeater system includes using
In the acceptance division for receiving RF input signals.RF input signals are included with associated with least one communication channel of communication network
At least one sub-band at least one frequency band.Acceptance division can digitize RF input signals to obtain data signal.Number
Word repeater system is also included with the wave filter for being used at least one digital filter that digital filtering is carried out to data signal
Equipment.Digital filter can have the passband for being used for being filtered to data signal.Digital filter can be filtered by setting
Device coefficient is configured.AGC device can control the gain of data signal.AGC device can be configured as setting
Put at least one of gain of data signal.Digital repeater system also includes being used to send at least one of RF output signals
Sending part.Sending part can convert digital signals into RF output signals and be used to send.
It can be reduced in use when device system in train environment according to the digital repeater system of some examples and conversed
The risk to go offline, while high data throughput can be obtained.
Control unit can be used to depending on the gain of AGC device is set to configure the filtering of digital filter
Device coefficient.The group delay observed in repeater system can depend on using the filter of digital filter in repeater system
Ripple device coefficient.By configuring the filter coefficient of the digital filter in digital repeater system, group delay can be adjusted so that
Predefined limit is no more than by the signal path of repeater system and the delay of direct signal path between base station and movement station
System (the predefined limitation is such as cyclic prefix in the lte networks).
In general, if repeater system is set using high-gain and the whole frequency for being handled by repeater system
Band or sub-band provide big gain, then digital filter of the processing comprising independent sub-band in this band can have
Big steepness --- for example, passband and with the transition between exterior domain is precipitous to cause to the strong and sharp of out of band signal
Sharp suppression (rejection).This can avoid exceeding to be amplified with allowing outside passband by predefined gain limitation and be not desired to
The signal wanted.
If set using low gain, then the risk that the predefined gain limitation outside passband is exceeded can very little.Definition
The frequency response of the passband of wave filter can have the steepness reduced --- for example, passband and adjacent between exterior domain
Transition can less.
If wave filter have reduce steepness, then for example when using FIR filter when, it can by using compared with
Few filter coefficient is realized.When using only a small amount of filter coefficient, the processing meeting in the wave filter of repeater system
Hurry up, so as to cause group delay to reduce and cause between the base station and mobile station by the signal path of repeater system with directly
Delay between signal path reduces.
By Optimal Filter coefficient, the number of filter coefficient for defining digital filter is used for especially by optimization
Amount, can optimize group delay, and this may rely on gain setting.
Set for high-gain, greater amount of filter coefficient can be used so that big steepness is presented in wave filter.
If the external network of one or more base stations covers weak and communication network reception signal and is exaggerated to be provided in train
Covering, then it is probably suitable that this high-gain, which is set,.In this scene, the signal received by movement station in train can
With essentially from repeater system so that the signal provided via repeater system can be relative to the letter directly received from base station
Number occupy an leading position.
If by base station provide the network coverage it is good, then repeater system can use compared with low gain set and can
To use the wave filter with the steepness reduced by using less filter coefficient, so as to cause less group delay
When.In this case, the signal received in train can be mainly directly from base station, wherein the signal directly received is with coming
It is small from the group delay between the signal of repeater system, to reduce the risk for the connection that goes offline.
Control unit can be configured as adjusting one or more numbers by setting the filter coefficient of digital filter
The steepness or width of the passband of word wave filter.Specifically, when using the digital filter of the passband with big steepness,
Relatively great amount of filter coefficient can be used.In turn, if using with the steepness reduced (for example, passband and with outer
Less sharp transition between region) passband digital filter, then less filter coefficient can be used, so as to
Cause less group delay.
Digital filter can be FIR (finite impulse response) wave filter.It is also possible, however, to use other types of filtering
Device.
Adjustment filter coefficient can be triggered by the change that gain is set.Can based on the network coverage in region come
Trigger the change that gain is set.The network in region can be determined by measuring reception (such as with reference to) signal from base station
Covering.Alternately, can by using the positional information obtained from alignment system (such as gps signal), using in given zone
Good or the bad network coverage knowledge is provided in domain to determine the network coverage.
In one embodiment, digital repeater system includes main computer unit and is connected to the one or more of main computer unit
Remote unit.Main computer unit can be for example on train center position, and remote unit distribution is in the different cars of train
Railway carriage or compartment is to provide the covering in train.Both main computer unit and remote unit can include acceptance division and sending part.In descending chain
On the direction of road, the acceptance division of main computer unit can receive one or more from one or more communication networks via air interface
The RF signals of individual base station, the RF signals are handled, and the sending part for providing it to different remote units is used for via remote unit
Relay.In the uplink direction, the acceptance division of remote unit can receive the RF signals inside train, and handle
RF signals are supplied to the sending part of main computer unit afterwards, sent for communication network towards the outside.
In this example, the function of acceptance division and sending part can also be distributed in main computer unit and remote unit and positioned at master
On one or more temporary locations between machine unit and remote unit.For example, in the uplink direction, can at one or
RF signals are received at multiple remote units, and the RF signals can be forwarded to the temporary location near main computer unit.
In temporary location, the signal received from remote unit can be processed, polymerize and be supplied to main computer unit outer for being sent to
Portion's network.In this illustration, digital filter can be located in temporary location so that most of processing of receiving side is in centre
Implement in unit.
Can provide Distributed coverage solution according to the digital repeater system of some examples so that including with
The RF of the frequency band of the associated each sub-band of various radiotechnics (GSM, UMTS, LTE signal etc. in 3GPP frequency bands)
Signal can be distributed to multiple remote units via main computer unit, to provide in congested areas (obstructed area)
Covering.Remote unit can be connected to main frame list via the network of optical fiber or via air interface or another RF connection means
Member.
Fig. 1 shows digital repeater system 1 in the diagram, and the system is with main computer unit 10 and multiple long-range lists
The distributing antenna system (DAS) of member 11.Main computer unit 10 can be located at train 4 on center position, and with antenna 100
It is associated or including antenna 100, main computer unit 10 can use air interface via antenna 100 be communicatively coupled to one or
One or more base stations 3 of multiple communication networks.Remote unit 11 is located in the different compartments 40 of train 4 and for spreading all over fire
The different compartments 40 of car 4 provide covering.
However, repeater system 1 can use (such as between floors or on building) in different environment.At this
In the case of kind, main computer unit 10 can be located at outside building and can be communicated with the remote unit 11 of interior of building.
It is contrasted with Fig. 1 example, main computer unit and (single) remote unit are integrated into an assembled unit wherein
In independent repeater system can alternatively installed in train 4 different compartments 40 on.In this case, repeater system
It may be implemented as the distributed system in the integrated unit being arranged on compartment, rather than such as Fig. 1 example.
Remote unit 11 is connected to main computer unit 10 via transmission medium 12 (such as network of optical fiber), and can be with master
Machine unit 10 communicates to connect.Each remote unit 11 includes antenna 110, and remote unit 11 is for example connected to fire via antenna 110
The mobile device 5 of user in the compartment 40 of car 4.
On the D of downlink direction, RF input signals RF is received via the antenna 100 at main computer unit 10IN, in main frame list
RF input signals RF is handled in member 10INTo be transmitted to different remote units 11 via transmission medium 12, and
Further after processing, RF output signals RF is sent as via antenna 110OUT.RF output signals RFOUTCan be by train 4
Compartment 40 in mobile device 5 receive.
Vice versa, on uplink direction U, the RF signals that are received at the antenna 110 of remote unit 11 via
Transmission medium 12 is fed to main computer unit 10, and the antenna for the base station 3 for arriving external communication network is relayed via antenna 100
30。
As shown in Fig. 2 functionally, digital repeater system 1 can perform the digital processing to RF signals.Fig. 2 is painted
Go out main computer unit 10 and the functional entity of the remote unit 11 of main computer unit 10 is connected to via transmission medium 12, these functions are real
Body is used to handle RF input signals RF on the D of downlink directionINTo relay (retransmission).
In the embodiment of fig. 2, main computer unit 10 includes being used to handle the RF input signals RF received by antenna 100IN's
Acceptance division 20.Specifically, acceptance division 20 include shape be bandpass filter RF wave filters 201, for filter out it is to be processed and
The frequency band of transmission is used to relay.RF input signals RF from RF wave filters 201INLow-noise amplifier 202 can be fed to
With low-converter 203 so that RF signals are downconverted into midband.Then, the signal is fed to analog-digital converter 204 with by RF
Signal digitizes, so as to obtain digital intermediate frequency signal IFIN。
Alternately, RF signals can alternatively be downconverted to base band I/Q signal (for example, zero IF).
Data signal IFINDigital signal processing unit (for example, DSP, FPGA, ASIC etc.) 205 is fed to, and in numeral
Digital processing is carried out in signal processing unit 205.
After digital signal processing, the signal through processing is transferred to the transmission of remote unit 11 via transmission medium 12
The digital signal processing unit 206 in portion 21, signal are further processed in signal processing unit 206, so as to obtain in intermediate frequency
Data signal IF in scopeOUT.Data signal IFOUTAnalog rf signal is converted into by digital analog converter 207, is up-converted device
208 up-conversions, filtered for the RF wave filters 210 of bandpass filter by the power amplification of power amplifier 209, by shape, and via remote
Cheng Danyuan 11 antenna 110 sends and is used as RF output signals RFOUT。
Substitute single digital analog converter, alternately, can use for i/q signal path two digital analog converters with
And the up-conversion using modulator.
On uplink direction U, RF input signals are received and handled by the acceptance division 20 of remote unit 11, and via
The sending part 21 of main computer unit 10 is further handled and sent.
As shown in figure 3, in DSP unit 205,206, digital filtering can occur.At data signal
Manage in device unit 205,206, the sub-band included in the frequency band handled by repeater system 1 can be isolated from each other, and can
With by digital filter 2111-211N、2121-212NSeparately processing.Digital filter 2111-211N、2121-212NIn it is each
Digital filter can include the passband associated with the carrier wave of the communication channel of communication network.Digital filter 2111-211N、
2121-212NIt can be programmed in terms of its bandwidth, its centre frequency and its pass-band performance by control unit 214.
Moreover, gain control is likely to occur in AGC device 2131-213NIn so that digital filter 2111-
211N、2121-212NThe gain of each passband can be set by control unit 214.This AGC device 2131-213N
Digital filter 211 can be integrated in1-211N、2121-212NIn.
Fig. 4 shows the example of the repeater in train environment.Mobile device 5 in the compartment 40 of train 4 can (example
Such as, via signal path B) directly from the reception signal of base station 3, while can be via the repeater system on train 4
1 (for example, via signal path A) reception signal of system.Signal can be overlapping in compartment 40, and if unlike signal path A,
Delay between B is too big (being greater than the cyclic prefix used in LTE connections), then has that connection goes offline or data gulp down
The risk that the amount of telling reduces.
Digital filter 2111-211N、2121-212NEach in (Fig. 3) has passband PB as shown in Figure 5, wherein
In digital filter 2111-211N、2121-212NBetween centre frequency and bandwidth can change.In passband PB, signal by,
And with by associated AGC device 2131-213NThe predefined gain G set.(the band exterior domain outside passband PB
OB), signal can be suppressed as much as possible, and will not be exaggerated and be determined more than by predefined gain limitation G2, G3, G4
As (wherein gain limitation G1 be applied to passband PB), wherein gain limitation G1-G4 can depending on network (for example, FCC,
3GPP, ETSI etc.).
For example, if digital filter is realized by FIR filter, then digital filter 2111-211N、2121-212N's
The characteristic of passband PB in frequency response can be determined by filter coefficient.Can by the quantity of used filter coefficient Lai
Determine steepness (such as passband PB and with the transition between exterior domain OB).In order in passband PB and with being realized between exterior domain OB
Sharp transition, substantial amounts of filter coefficient can be typically used, and can cause the precipitous of reduction using less filter coefficient
Degree.In general, steepness can be selected so that limits G1, G2, G3, G4 no more than gain.
In general, the use of a large amount of filter coefficients adds the group delay as caused by repeater system 1.If use
Less filter coefficient defines digital filter 2111-211N、2121-212N, then the group delay as caused by digital filter
When reduce.Optimal Filter coefficient can optimize the group delay as caused by repeater system 1.
For the digital filter 211 shown in Fig. 51-211N、2121-212NFrequency response, if reduce gain set
Put, then the requirement of the steepness to passband PB can be reduced, because being less likely beyond gain limitation G1-G4.If for example,
The gain in passband PB, which is set, in Figure 5 reduces 40dB (indexing is equal to 10dB), then can greatly reduce passband PB's
Steepness more than gain without limiting any one risk in G1, G2, G3, G4.
Can be by prolonging depending on gain is set to set filter coefficient so as to optimize as caused by repeater system 1
Late.Based on different standards gain can be selected to set.
If finding the good network coverage in the region that train 4 passes through, and directly received from base station 3 (in Fig. 4
Signal path B) signal by force to being enough the offer covering in the train 4, then the gain of repeater system 1 can greatly reduce,
To allow using less filter coefficient and improve the delay caused by repeater system 1 so that greatly reduce dropped call
Risk.
On the contrary, if the network coverage in region is poor, then the letter received by the mobile device 5 in the compartment 40 of train 4
Number largely it can be dominated by the signal received via repeater system 1 (signal path A).High-gain set together with communication
The associated digital filter 211 of channel1-211N、2121-212NSharp passband PB can be used for repeater system 1.Because
Mobile device 5 may be mainly via the reception signal of repeater system 1, and can hardly receive any letter directly from base station 3
Number, so the risk of dropped call can be low.
Can be to determine the network coverage by measuring the reference signal (or signal of similar type) received from base station 3
It is or poor.Or can determine which region current train 4 is located in by alignment system (such as GPS), if for one
Network coverage in the region known to region is good or bad, then can correspondingly set gain in this region.
It is the example example that can wherein trigger the requirement set to new gain below：
The maximization gain-adjusted that the variable gain according to obtained from being set due to user is limited.
The maximization gain-adjusted that the gain according to obtained from due to isolation measurement limits is (for example, DAS gain is low
In isolation of the alms giver (donor) between transmission antenna).
According to the change in gain of specific GPS location (for example, gain setting and GPS location can be in certain look-up tables
It is predefined).
According to the change in gain of any kind of input signal.
Measured according to the RSSI (received signal strength indicator device) based on predefined threshold value (for example, exceeding threshold value)
Change in gain.
According to the general change in gain of rssi measurement (for example, operation immediately).
Figure 6 illustrates the flow chart of the example of the process for Optimal Filter coefficient.If depend in square frame S1
Find to need new gain to set in the network coverage for example provided in the zone, then set new system to increase in square frame S2
Benefit.New gain is found no need for if instead of ground to set, then continue normal operating in square frame S4.
If new system gain is applied in square frame S2, then adjust filter coefficient in square frame S3 so that obtain
The possible minimum group delay set according to the gain.It is, for example, possible to use the filter coefficient of possible minimum quantity so that
Gain limitation G2-G4 in addition to the passband PB shown in Fig. 5 is not exceeded.This can be according to the gain defined in addition to passband PB
Limits value G2-G4 look-up table occurs, and then can be used for look-up table determine filter coefficient.
In additional aspect, repeater system 1 can provide basic amplification (gain) for whole frequency band, wherein being put for this
Big gain setting is unrelated with the network coverage.If to be provided for the signal associated with the specific communication channel of sub-band additional
Gain, then the gain for this sub-band can be additionally provided in so that the signal be attached (beyond basic amplification
Ground) amplification.
Additional amplification can be by the as shown in Figure 3 AGC device 213 associated with specific communication channel1-
213NGain set cause.Depending on AGC device 2131-213NGain set, can be in the above described manner at optimization
Manage the digital filter 211 of signal1-211N、2121-212NFilter coefficient so that the group delay of signal is optimised.
Under any circumstance, repeater system 1 can provide applied to whole frequency band and be the basic amplification in broadband
(being contrasted with acting on the amplification of the arrowband in independent communication channel).Depending on the network coverage, can optimize as described above
The arrowband amplification of independent communication channel, and can be based on being used for the communication channel for the filter coefficient of specific communication channel
Gain set and optimize.
Described above, this mesh for being merely to illustrate that and describing of some examples (including shown example) has been given
, and be not intended to detailed or the disclosure is restricted to disclosed precise forms.Without departing substantially from the scope of the present disclosure
In the case of, many modifications, adapt to and its use be to those skilled in the art clearly.
Claims (20)
1. a kind of digital repeater system for being used to relay RF signals, the digital repeater system include：
Acceptance division, it is configurable for receiving RF input signals, the RF input signals include having with communication network at least
At least one frequency band of the associated at least one sub-band of one communication channel, the acceptance division is configured as the RF is defeated
Enter signal digitlization to obtain data signal；
Filter apparatus, including at least one digital filter, at least one digital filter, which has, to be used for the number
Word signal carries out the passband of digital filtering, and at least one digital filter can be configured by setting filter coefficient；
AGC device, it can be configured as setting at least one of gain of the data signal；
At least one sending part, it is configurable for sending RF output signals and described for the data signal to be converted into
RF output signals are to be transmitted；And
Control unit, set suitable for the gain based on the AGC device to configure at least one digital filter
Filter coefficient.
2. digital repeater system as claimed in claim 1, wherein, the steepness or width of the passband can pass through setting
The filter coefficient adjusts.
3. digital repeater system as claimed in claim 1, wherein at least one digital filter is FIR filter.
4. digital repeater system as claimed in claim 1, wherein, at least one digital filter includes：
First digital filter of high-order, high-gain setting can be configurable for, and
Second digital filter of low order, there is the exponent number less than the high-order, and can be configured to less than the high increasing
The low gain that benefit is set is set.
5. digital repeater system as claimed in claim 4, wherein, the quantity for the filter coefficient of the high-order is more than
Quantity for the filter coefficient of the low order.
6. digital repeater system as claimed in claim 1, wherein, the gain is set based on the network coverage in region
Put.
7. digital repeater system as claimed in claim 1, wherein, the filter coefficient can be based on the gain and set
Change and adjust.
8. digital repeater system as claimed in claim 1, wherein, the filter coefficient can be adjusted so that group delay
Minimize.
9. digital repeater system as claimed in claim 1, wherein, the network coverage determines according to following item：
The signal received from base station；Or
The positional information obtained via gps signal.
10. digital repeater system as claimed in claim 1, in addition to：
Main computer unit；And
At least one remote unit, at least one remote unit can be remotely located relative to the main computer unit, described
At least one remote unit is configured as being communicatively coupled to the main computer unit via transmission medium.
11. a kind of method, including：
By digital repeater system acceptance division receive RF input signals, the RF input signals include comprising with communication network
At least one frequency band of the associated at least one sub-band of at least one communication channel, the acceptance division, which inputs the RF, to be believed
Number digitlization is to form data signal；
By the filter apparatus including at least one digital filter to the data signal carry out digital filtering, described at least one
Individual digital filter has the passband for being used for being filtered to the data signal, wherein, at least one digital filter
Configured by setting filter coefficient；
The gain of the data signal is controlled by the AGC device of the gain of the setting data signal；
At least one digital filter is configured based on the gain of the AGC device set by control unit
Filter coefficient；And
The data signal is converted into RF output signals by least one sending part of the digital repeater system and sent
The RF output signals.
12. method as claimed in claim 11, wherein configuring the steepness that the filter coefficient includes adjusting the passband
Or width.
13. method as claimed in claim 11, wherein at least one digital filter is FIR filter.
14. method as claimed in claim 11, wherein at least one digital filter includes：
First digital filter of high-order, it has high-gain setting；And
Second digital filter of low order, it has the exponent number less than the high-order and the low increasing less than high-gain setting
Benefit is set.
15. method as claimed in claim 14, wherein the quantity for the filter coefficient of the high-order is more than for described
The quantity of the filter coefficient of low order.
16. method as claimed in claim 11, wherein setting the gain based on the network coverage in region.
17. method as claimed in claim 11, wherein adjusting the filter coefficient based on the change that gain is set.
18. method as claimed in claim 11, wherein adjusting the filter coefficient so that group delay minimizes.
19. method as claimed in claim 11, in addition to the network coverage is determined according to following item：
The signal received from base station；Or
The positional information obtained via gps signal.
20. method as claimed in claim 11, wherein the digital repeater system includes：
Main computer unit；And
At least one remote unit, at least one remote unit are positioned in the compartment of train and relative to the main frame lists
Member is remotely located, and at least one remote unit is being communicatively coupled to the main computer unit via transmission medium.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP15161404.7 | 2015-03-27 | ||
| EP15161404 | 2015-03-27 | ||
| PCT/IB2015/058038 WO2016156950A1 (en) | 2015-03-27 | 2015-10-19 | Digital repeater system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107408975A true CN107408975A (en) | 2017-11-28 |
| CN107408975B CN107408975B (en) | 2020-05-05 |
Family
ID=54146899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580078132.9A Expired - Fee Related CN107408975B (en) | 2015-03-27 | 2015-10-19 | Digital repeater system and method |
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| Country | Link |
|---|---|
| US (1) | US10461839B2 (en) |
| EP (2) | EP3748868A1 (en) |
| CN (1) | CN107408975B (en) |
| WO (1) | WO2016156950A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020117835A1 (en) | 2018-12-04 | 2020-06-11 | Commscope Technologies Llc | Distributed antenna system for use along train track |
| EP4378090A1 (en) * | 2021-09-01 | 2024-06-05 | Sony Group Corporation | Coverage enhancing devices with frequency filters |
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|---|---|---|---|---|
| CN102422562A (en) * | 2009-05-11 | 2012-04-18 | 高通股份有限公司 | Inserted pilot construction for an echo cancellation repeater |
| CN102821417A (en) * | 2011-06-08 | 2012-12-12 | 安德鲁有限责任公司 | System and method for reducing desensitization of a base station transceiver for mobile wireless repeater systems |
| CN103178524A (en) * | 2011-12-23 | 2013-06-26 | 广西星宇智能电气有限公司 | Digital filter used for active power filter |
| US20130177047A1 (en) * | 2012-01-10 | 2013-07-11 | R-Tron Inc. | Repeater using digital filter and method for digital filtering using the same |
| US20130189921A1 (en) * | 2010-09-21 | 2013-07-25 | Andrew Llc | Multipath interference cancellation through cepstrum analysis |
| US20130242820A1 (en) * | 2012-03-16 | 2013-09-19 | Qualcomm Incorporated | Digital filter control for filter tracking speedup |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4901416B2 (en) * | 2006-10-16 | 2012-03-21 | 株式会社東芝 | Digital filter device |
| EP2530840B1 (en) * | 2011-05-30 | 2014-09-03 | Harman Becker Automotive Systems GmbH | Efficient sub-band adaptive FIR-filtering |
| US8837559B2 (en) | 2012-08-16 | 2014-09-16 | Andrew Wireless Systems Gmbh | Reducing distortion in repeaters for OFDM signals |
-
2015
- 2015-10-19 EP EP20180400.2A patent/EP3748868A1/en active Pending
- 2015-10-19 WO PCT/IB2015/058038 patent/WO2016156950A1/en active Application Filing
- 2015-10-19 US US15/560,113 patent/US10461839B2/en not_active Expired - Fee Related
- 2015-10-19 EP EP15785194.0A patent/EP3275095B1/en active Active
- 2015-10-19 CN CN201580078132.9A patent/CN107408975B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102422562A (en) * | 2009-05-11 | 2012-04-18 | 高通股份有限公司 | Inserted pilot construction for an echo cancellation repeater |
| US20130189921A1 (en) * | 2010-09-21 | 2013-07-25 | Andrew Llc | Multipath interference cancellation through cepstrum analysis |
| CN102821417A (en) * | 2011-06-08 | 2012-12-12 | 安德鲁有限责任公司 | System and method for reducing desensitization of a base station transceiver for mobile wireless repeater systems |
| CN103178524A (en) * | 2011-12-23 | 2013-06-26 | 广西星宇智能电气有限公司 | Digital filter used for active power filter |
| US20130177047A1 (en) * | 2012-01-10 | 2013-07-11 | R-Tron Inc. | Repeater using digital filter and method for digital filtering using the same |
| US20130242820A1 (en) * | 2012-03-16 | 2013-09-19 | Qualcomm Incorporated | Digital filter control for filter tracking speedup |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3275095A1 (en) | 2018-01-31 |
| US10461839B2 (en) | 2019-10-29 |
| CN107408975B (en) | 2020-05-05 |
| US20180102829A1 (en) | 2018-04-12 |
| EP3748868A1 (en) | 2020-12-09 |
| EP3275095B1 (en) | 2020-08-12 |
| WO2016156950A1 (en) | 2016-10-06 |
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